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Madden genealogies, pre-1703
(described as "the principal
families in Ireland at the close of the 17th century"),
[TCD] Ms 1217
(formerly called Ms vol. F.4.18),
may only be consulted
on microfilm at [TCD] Ms

[O'Hart, 1884]
says this
has genealogy of CASHELL,
but can't find in index.
Anyway the genealogies
(in the microfilm version at least)
are illegible.
They need to be decoded by an expert
and published.

George Cashel,
George Blennerhassett Cashel,
born 1807, Co.Kerry.
Since he retired 1 Feb 1867, maybe this was at age 60 and maybe he was born around 1 Feb 1807.
Catholic (though this may only have been through his marriage in 1838).
[PAT/13, no.6]
lists him as "George Edward Cashel",
but the only contemporary record of his middle name is
his son's wedding 1869
which lists him as "George Blennerhassett Cashel".

Some fictional Gaelic genealogy about Cashel from
Pat Lavelle
in
[PAT/4].
She refers to her grandfather
Blennerhassett Cashel.
Pat was fascinated by old Gaelic Ireland, but ironically, she could not see that Blennerhassett, not Cashel, or any other family,
was
the only line that could actually
give her a real descent from old Gaelic Ireland.
A bit more work on the real Cashel tree
would probably have yielded all the ancient Gaelic ancestry anyone could want.

The claimed connection of Blennerhassett Cashel to the Kings of Cashel is imaginary.

The following are a Cashell (or sometimes Cashel) family of Co.Kerry
(and Co.Tipperary)
who descend from Blennerhassett through a marriage in the 1720s.
This could be our family,
or it may be just a coincidence.

This could be our family:

This could be our family, but they wouldn't suddenly start
adopting Blennerhassett as a name
in 1807 unless there was another, later connection to the Blennerhassetts.
Perhaps this is our family, and the reason that
the 1807
Cashel
and Blennerhassett got together was because they were already connected.

This Cashell family are connected to Blennerhassett since the 1720s,
and stayed in touch with their
Blennerhassett relations through the 18th century,
notably with the
Ballyseedy branch.
This would have provided lots of opportunity
for a Cashel to get together with a Blennerhassett:

This Cashell family lived in and near Tralee, Co.Kerry,
and also had an estate at Shallee, N Co.Tipperary.
Our
George Blennerhassett Cashel
was born in Co.Kerry
and settled in Co.Tipperary
(though only because he was sent there by his job in the police,
and he was sent nowhere near Shallee).

How did our Cashel become Catholic?
Interestingly,
Jacobie O'Leary Cashel
thought her great-grandfather
Rowan Cashel
was Catholic.
Rowan was defended by the Catholic Daniel O'Connell.
Could Ellen Alton have been Catholic,
and this is where the Catholic line came in,
and then Rowan's brother be the Catholic who married the
Blennerhassett?
Not very likely. See below.

This could be just a coincidence:

This could be just a coincidence.
There could be two Cashel families connected to Blennerhassett.

The biggest problem is that
this family are Protestant.
If Cashel were Protestant,
and Blennerhassett were Protestant,
then how did my Cashels become Catholic?

Apart from Jacobie O'Leary Cashel,
there is no sign that any of these Cashels are Catholic.
Rowan Cashel's marriage licence 1816
would surely have mentioned it.

Also Rowan's brother
George
seems to inherit Shallee,
and have a son George of Shallee, so this cannot be our line.
Unless there is another brother Edward.

We start this family
with the following.
The Ballynevan area of Co.Clare seems to be the ancestral home:

Patrick Cashell,
or Cashel, gentleman,
of "Ballynavin", Co.Clare,
NOT Co.Kerry,
think this is Ballynevan,
Kilfinaghta par, SE Co.Clare
(N of Sixmilebridge,
not far from Co.Limerick border,
Limerick city and Co.Tipperary border,
see map),
since this is prob. the same family as that of Sixmilebridge below,
so think this is NOT Ballyknavin,
O'Briensbridge par,
SE Co.Clare
(NW of O'Briensbridge,
closer to Co.Tipperary border,
across the far side of the River Shannon
from Shallee area, Co.Tipperary),
also, it may be coincidence, but Ballynevan is in
the "Mountcashel" area,
Patrick's
will dated 24th Jan 1734,
died 1734-35,
will proved 17th Mar 1735
[Index to Irish Wills, vol.3],
think burnt in Four Courts 1922,
this also noted in
[Betham abstracts]
vol.8 p.73,
[NLI] GO Ms 230,
[NLI] microfilm POS 1220 (illegible),
had issue:

And this is probably the same Francis Cashell that married Rowan,
for three reasons,
(a) the date of birth is about right,
(b) then Patrick
is the great-grandfather of Rowan Patrick Cashell
and must be the origin of his middle name,
and (c) later, as of 1760, Ballynevan seems to be connected with
Henry Cashell:

Francis Cashell,
of Shallee, N Co.Tipperary
[near E Co.Clare and NE Co.Limerick],
married 1720s to
Rowan of Co.Kerry [whose mother was a Blennerhassett],
family lived in both Co.Tipperary and Co.Kerry.

Heather Cashell
says the story in her family is that:
"The story behind the different spellings of this last name is a feud
between 2 brothers. They hated each other so much that one
added another L onto the end of his name
so no one would know they were related."